Arcade Fire's songwriting couple Régine Chassagne and Win Butler have reportedly become parents. A Montreal clergyman has said they have a week-old baby boy.

"It's good to see that they are always together and that now they have a baby," Barry Mack told the Journal de Montréal. "That's pretty rare in the entertainment business." Mack, a pastor at St Andrew's presbyterian church in Saint-Lambert, is a longtime friend of Chassagne's father.

The baby was apparently born on Sunday 21 April, weighing seven pounds.

Although there were reports that Chassagne was pregnant, Arcade Fire have not publicly commented on them. But journalists observed two baby bumps at the band's most recent gig: Arcade Fire's touring violist, Marika Anthony-Shaw, is also expecting.

Arcade Fire's baby boom is likely to have complicated plans for the group's fourth album. They have been working for months on the followup to 2010's The Suburbs, recording songs at home in Montreal and at James Murphy's studio in New York. The goal was to "get something finished in the spring", drummer Jeremy Gara said in October. In the meantime, band members Sarah Neufeld and Richard Reed Parry have pursued their own solo material, and Will Butler is composing the score for a short film. It's "Bartok meets John Carpenter", he said in a press release.